The answer is nearly four centuries ago - December 21, 1638.

答案是近4个世纪以前——1638年12月21日。

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Think how much more information we have than Copernicus had four centuries ago.

试想我们拥有的信息比四百年前的哥白尼多了多少。

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Astronomers have much sharper eyes at their disposal now than they did four centuries ago.

和4个世纪前相比，天文学家们现在有更敏锐的“眼睛”来供他们使用。

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But on that sunny January 30th four centuries ago, a fully laden 60 tonne ship in Appledore harbour, north Devon, was picked up and dumped in nearby marshland.

ECONOMIST: A tsunami may have struck Britain 400 years ago

As always, Shakespeare wrote about it four centuries ago.

FORBES: When You Hear "There's No Problem," Brace Yourself

When the Pilgrims at Plymouth Colony gave thanks for a bountiful harvest nearly four centuries ago, they enjoyed the fruits of their labor with the Wampanoag tribe -- a people who had shared vital knowledge of the land in the difficult months before.

WHITEHOUSE: Presidential Proclamation -- Thanksgiving Day, 2012